*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue: #2563EB;
  --blue-dark: #1E40AF;
  --blue-light: #EFF6FF;
  --text: #1E293B;
  --text-muted: #64748B;
  --border: #E2E8F0;
  --bg: #FAFAFA;
  --white: #fff;
  --accent: #F59E0B;
  --radius: 8px;
  --font-serif: 'Merriweather', Georgia, serif;
  --font-sans: 'Source Sans 3', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.7;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* HEADER */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}

.logo-text {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
  letter-spacing: -0.3px;
}

.main-nav {
  display: flex;
  gap: 28px;
  align-items: center;
}

.main-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.main-nav a:hover { color: var(--blue); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--text);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
}

.mobile-nav.open { display: flex; }

.mobile-nav a {
  padding: 10px 0;
  font-weight: 500;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  text-decoration: none;
}

.mobile-nav a:last-child { border-bottom: none; }

/* HERO */
.hero {
  background: linear-gradient(135deg, #EFF6FF 0%, #F0F9FF 100%);
  padding: 80px 0 70px;
  border-bottom: 1px solid var(--border);
}

.hero-inner { max-width: 620px; }

.hero-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--blue);
  margin-bottom: 16px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
  margin-bottom: 20px;
}

.hero h1 em {
  font-style: italic;
  color: var(--blue);
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.btn-primary {
  background: var(--blue);
  color: #fff;
  padding: 12px 26px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background 0.2s;
}

.btn-primary:hover { background: var(--blue-dark); text-decoration: none; }

.btn-ghost {
  background: transparent;
  color: var(--blue);
  padding: 12px 26px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1.5px solid var(--blue);
  text-decoration: none;
  transition: all 0.2s;
}

.btn-ghost:hover { background: var(--blue-light); text-decoration: none; }

/* CATEGORIES */
.categories { padding: 60px 0 20px; }

.cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.cat-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px 24px;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow 0.2s, border-color 0.2s;
  display: block;
}

.cat-card:hover {
  box-shadow: 0 4px 20px rgba(37,99,235,0.09);
  border-color: #BFDBFE;
  text-decoration: none;
}

.cat-icon { margin-bottom: 14px; }

.cat-card h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--text);
}

.cat-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}

.cat-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue);
}

/* POSTS */
.featured-posts { padding: 50px 0 70px; }

.section-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 32px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--border);
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.post-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  transition: box-shadow 0.2s;
}

.post-card:hover { box-shadow: 0 4px 20px rgba(0,0,0,0.06); }

.post-card.featured { grid-column: span 1; }

.post-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--blue);
  background: var(--blue-light);
  padding: 3px 9px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.post-card h2 {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
}

.post-card h2 a {
  color: var(--text);
  text-decoration: none;
}

.post-card h2 a:hover { color: var(--blue); }

.post-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}

.post-meta {
  font-size: 0.78rem;
  color: #94A3B8;
}

/* BANNER */
.banner-strip {
  background: var(--blue);
  padding: 18px 0;
  text-align: center;
}

.banner-strip p {
  color: rgba(255,255,255,0.88);
  font-size: 0.95rem;
}

.banner-strip a {
  color: #fff;
  font-weight: 600;
  text-decoration: underline;
}

/* FOOTER */
.site-footer {
  background: var(--text);
  color: #94A3B8;
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid #334155;
}

.footer-brand .logo-text { color: #fff; }

.footer-tagline {
  font-size: 0.88rem;
  margin-top: 12px;
  color: #64748B;
  line-height: 1.6;
}

.footer-links h4 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #fff;
  margin-bottom: 14px;
}

.footer-links a {
  display: block;
  font-size: 0.88rem;
  color: #94A3B8;
  margin-bottom: 8px;
  text-decoration: none;
}

.footer-links a:hover { color: #fff; }

.footer-bottom {
  padding: 28px 0;
}

.disclaimer-note {
  font-size: 0.78rem;
  color: #475569;
  line-height: 1.7;
  max-width: 820px;
  margin-bottom: 14px;
}

.copyright {
  font-size: 0.78rem;
  color: #475569;
}

/* INNER PAGE */
.page-hero {
  background: linear-gradient(135deg, #EFF6FF 0%, #F0F9FF 100%);
  padding: 52px 0 44px;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.page-hero p {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 520px;
}

.breadcrumb {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.breadcrumb a { color: var(--blue); }

/* ARTICLE PAGE */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  padding: 52px 0 80px;
  align-items: start;
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin: 36px 0 14px;
  padding-top: 8px;
}

.article-body h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  margin: 26px 0 10px;
}

.article-body p {
  font-size: 0.97rem;
  line-height: 1.8;
  margin-bottom: 18px;
  color: #334155;
}

.article-body ul, .article-body ol {
  padding-left: 22px;
  margin-bottom: 18px;
}

.article-body li {
  font-size: 0.97rem;
  line-height: 1.8;
  margin-bottom: 6px;
  color: #334155;
}

.article-body .note-box {
  background: var(--blue-light);
  border-left: 4px solid var(--blue);
  padding: 16px 18px;
  border-radius: 0 6px 6px 0;
  margin: 24px 0;
  font-size: 0.9rem;
}

.article-body .warn-box {
  background: #FFFBEB;
  border-left: 4px solid var(--accent);
  padding: 16px 18px;
  border-radius: 0 6px 6px 0;
  margin: 24px 0;
  font-size: 0.9rem;
}

.step-list {
  counter-reset: steps;
  list-style: none;
  padding: 0;
}

.step-list li {
  counter-increment: steps;
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.step-list li::before {
  content: counter(steps);
  background: var(--blue);
  color: #fff;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

/* SIDEBAR */
.sidebar-widget {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px;
  margin-bottom: 24px;
}

.sidebar-widget h4 {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.sidebar-widget ul {
  list-style: none;
  padding: 0;
}

.sidebar-widget li {
  margin-bottom: 10px;
}

.sidebar-widget a {
  font-size: 0.88rem;
  color: var(--text);
  text-decoration: none;
}

.sidebar-widget a:hover { color: var(--blue); }

/* CONTACT PAGE */
.contact-section { padding: 60px 0 80px; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.contact-info p {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.7;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 24px;
}

.contact-icon {
  width: 42px;
  height: 42px;
  background: var(--blue-light);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-item-text h5 {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.contact-item-text p {
  font-size: 0.95rem;
  color: var(--text);
  margin: 0;
}

.contact-item-text a {
  color: var(--blue);
}

.contact-note {
  background: var(--blue-light);
  border-radius: 10px;
  padding: 28px;
}

.contact-note h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 14px;
}

.contact-note p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.contact-note p:last-child { margin-bottom: 0; }

/* PROSE PAGE (disclaimer, privacy) */
.prose-section { padding: 60px 0 80px; }

.prose-content { max-width: 740px; }

.prose-content h2 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  margin: 32px 0 12px;
}

.prose-content p {
  font-size: 0.95rem;
  color: #334155;
  line-height: 1.8;
  margin-bottom: 16px;
}

.prose-content ul {
  padding-left: 20px;
  margin-bottom: 16px;
}

.prose-content li {
  font-size: 0.95rem;
  line-height: 1.8;
  color: #334155;
  margin-bottom: 6px;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .cat-grid { grid-template-columns: 1fr; }
  .posts-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .main-nav { display: none; }
  .nav-toggle { display: block; }
  .hero h1 { font-size: 1.9rem; }
  .posts-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; }
  .btn-primary, .btn-ghost { text-align: center; }
}